Re: [PATCH v1 2/2] fuse: support io-uring registered buffers

[kernel test robot <lkp@intel.com>]

Hi Joanne,

kernel test robot noticed the following build errors:

[auto build test ERROR on mszeredi-fuse/for-next]
[also build test ERROR on linus/master v6.18-rc2 next-20251023]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Joanne-Koong/io-uring-add-io_uring_cmd_get_buffer_info/20251023-042601
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse.git for-next
patch link:    https://lore.kernel.org/r/20251022202021.3649586-3-joannelkoong%40gmail.com
patch subject: [PATCH v1 2/2] fuse: support io-uring registered buffers
config: i386-buildonly-randconfig-002-20251023 (https://download.01.org/0day-ci/archive/20251023/202510232038.LOpSOOQa-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251023/202510232038.LOpSOOQa-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202510232038.LOpSOOQa-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from fs/fuse/dev.c:9:
>> fs/fuse/dev_uring_i.h:51:20: error: field has incomplete type 'struct iov_iter'
      51 |                         struct iov_iter payload_iter;
         |                                         ^
   include/linux/fs.h:74:8: note: forward declaration of 'struct iov_iter'
      74 | struct iov_iter;
         |        ^
   In file included from fs/fuse/dev.c:9:
   fs/fuse/dev_uring_i.h:52:20: error: field has incomplete type 'struct iov_iter'
      52 |                         struct iov_iter headers_iter;
         |                                         ^
   include/linux/fs.h:74:8: note: forward declaration of 'struct iov_iter'
      74 | struct iov_iter;
         |        ^
   2 errors generated.
--
   In file included from fs/fuse/dev_uring.c:8:
>> fs/fuse/dev_uring_i.h:51:20: error: field has incomplete type 'struct iov_iter'
      51 |                         struct iov_iter payload_iter;
         |                                         ^
   include/linux/fs.h:74:8: note: forward declaration of 'struct iov_iter'
      74 | struct iov_iter;
         |        ^
   In file included from fs/fuse/dev_uring.c:8:
   fs/fuse/dev_uring_i.h:52:20: error: field has incomplete type 'struct iov_iter'
      52 |                         struct iov_iter headers_iter;
         |                                         ^
   include/linux/fs.h:74:8: note: forward declaration of 'struct iov_iter'
      74 | struct iov_iter;
         |        ^
>> fs/fuse/dev_uring.c:588:22: error: no member named 'fixed_buffer' in 'struct fuse_ring_ent'
     588 |         payload_iter = ent->fixed_buffer.payload_iter;
         |                        ~~~  ^
   fs/fuse/dev_uring.c:590:22: error: no member named 'fixed_buffer' in 'struct fuse_ring_ent'
     590 |         headers_iter = ent->fixed_buffer.headers_iter;
         |                        ~~~  ^
>> fs/fuse/dev_uring.c:618:43: error: no member named 'user' in 'struct fuse_ring_ent'
     618 |         err = copy_from_user(&ring_in_out, &ent->user.headers->ring_ent_in_out,
         |                                             ~~~  ^
   fs/fuse/dev_uring.c:623:38: error: no member named 'user' in 'struct fuse_ring_ent'
     623 |         err = import_ubuf(ITER_SOURCE, ent->user.payload, ring->max_payload_sz,
         |                                        ~~~  ^
   fs/fuse/dev_uring.c:653:22: error: no member named 'fixed_buffer' in 'struct fuse_ring_ent'
     653 |         payload_iter = ent->fixed_buffer.payload_iter;
         |                        ~~~  ^
   fs/fuse/dev_uring.c:656:22: error: no member named 'fixed_buffer' in 'struct fuse_ring_ent'
     656 |         headers_iter = ent->fixed_buffer.headers_iter;
         |                        ~~~  ^
   fs/fuse/dev_uring.c:725:36: error: no member named 'user' in 'struct fuse_ring_ent'
     725 |         err = import_ubuf(ITER_DEST, ent->user.payload, ring->max_payload_sz, &iter);
         |                                      ~~~  ^
   fs/fuse/dev_uring.c:741:29: error: no member named 'user' in 'struct fuse_ring_ent'
     741 |                         err = copy_to_user(&ent->user.headers->op_in, in_args->value,
         |                                             ~~~  ^
   fs/fuse/dev_uring.c:762:27: error: no member named 'user' in 'struct fuse_ring_ent'
     762 |         err = copy_to_user(&ent->user.headers->ring_ent_in_out, &ent_in_out,
         |                             ~~~  ^
   fs/fuse/dev_uring.c:797:39: error: no member named 'fixed_buffer' in 'struct fuse_ring_ent'
     797 |                 struct iov_iter headers_iter = ent->fixed_buffer.headers_iter;
         |                                                ~~~  ^
   fs/fuse/dev_uring.c:807:28: error: no member named 'user' in 'struct fuse_ring_ent'
     807 |                 err = copy_to_user(&ent->user.headers->in_out, &req->in.h,
         |                                     ~~~  ^
   fs/fuse/dev_uring.c:936:39: error: no member named 'fixed_buffer' in 'struct fuse_ring_ent'
     936 |                 struct iov_iter headers_iter = ent->fixed_buffer.headers_iter;
         |                                                ~~~  ^
   fs/fuse/dev_uring.c:944:43: error: no member named 'user' in 'struct fuse_ring_ent'
     944 |                 err = copy_from_user(&req->out.h, &ent->user.headers->in_out,
         |                                                    ~~~  ^
   fs/fuse/dev_uring.c:1187:12: error: no member named 'fixed_buffer' in 'struct fuse_ring_ent'
    1187 |                                         &ent->fixed_buffer.payload_iter, cmd, 0);
         |                                          ~~~  ^
   fs/fuse/dev_uring.c:1194:12: error: no member named 'fixed_buffer' in 'struct fuse_ring_ent'
    1194 |                                         &ent->fixed_buffer.headers_iter, cmd, 0);
         |                                          ~~~  ^
   fs/fuse/dev_uring.c:1245:7: error: no member named 'user' in 'struct fuse_ring_ent'
    1245 |         ent->user.headers = iov[0].iov_base;
         |         ~~~  ^
   fs/fuse/dev_uring.c:1246:7: error: no member named 'user' in 'struct fuse_ring_ent'
    1246 |         ent->user.payload = iov[1].iov_base;
         |         ~~~  ^
   19 errors generated.


vim +51 fs/fuse/dev_uring_i.h

    38	
    39	/** A fuse ring entry, part of the ring queue */
    40	struct fuse_ring_ent {
    41		/* True if daemon has registered its buffers ahead of time */
    42		bool is_fixed_buffer;
    43		union {
    44			/* userspace buffer */
    45			struct {
    46				struct fuse_uring_req_header __user *headers;
    47				void __user *payload;
    48			} user;
    49	
    50			struct {
  > 51				struct iov_iter payload_iter;
    52				struct iov_iter headers_iter;
    53			} fixed_buffer;
    54		};
    55	
    56		/* the ring queue that owns the request */
    57		struct fuse_ring_queue *queue;
    58	
    59		/* fields below are protected by queue->lock */
    60	
    61		struct io_uring_cmd *cmd;
    62	
    63		struct list_head list;
    64	
    65		enum fuse_ring_req_state state;
    66	
    67		struct fuse_req *fuse_req;
    68	};
    69	

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